<template>
  <transition name="slide">
    <div class="user-center">
      <div class="back" @click="back">
        <i class="iconfont icon-back"></i>
      </div>
      <div class="switches-wrapper">
        <switches @switch="switchItem" :switches="switches" :currentIndex="currentIndex" />
      </div>
      <div class="play-btn" ref="playBtn" @click="random">
        <i class="iconfont icon-play"></i>
        <span class="text">随机播放全部</span>
      </div>
      <div class="list-wrapper" ref="listWrapper">
        <scroll ref="favListScroll"
          class="list-scroll"
          v-if="currentIndex === 0" :data="favoriteList"
        >
          <div class="list-inner">
            <song-list :songs="favoriteList" @select="selectSong" />
          </div>
        </scroll>
        <scroll ref="playListScroll"
          class="list-scroll"
          v-if="currentIndex === 1" :data="playHistory"
        >
          <div class="list-inner">
            <song-list :songs="playHistory" @select="selectSong" />
          </div>
        </scroll>
      </div>
      <div class="no-result-wrapper" v-show="noResult">
        <no-result :title="noResultDesc" />
      </div>
    </div>
  </transition>
</template>

<script>
import Switches from '../../base/switches/Switches'
import Scroll from '../../base/scroll/Scroll'
import SongList from '../../base/song-list/SongList'
import Song from '../../assets/js/song'
import NoResult from '../../base/no-result/NoResult'
import { mapGetters, mapActions } from 'vuex'
import { playlistMixin } from '../../assets/js/mixin'

export default {
  name: 'UserCenter',
  mixins: [playlistMixin],
  data() {
    return {
      currentIndex: 0,
      switches: [
        { name: '我喜欢的' },
        { name: '最近听的' }
      ]
    }
  },
  computed: {
    noResult() {
      if (this.currentIndex === 0) {
        return !this.favoriteList.length
      } else {
        return !this.playHistory.length
      }
    },
    noResultDesc() {
      if (this.currentIndex === 0) {
        return '暂无收藏歌曲'
      } else {
        return '你还没有听过歌曲'
      }
    },
    ...mapGetters([
      'favoriteList',
      'playHistory'
    ])
  },
  methods: {
    handlePlaylist(playlist) {
      const bottom = playlist.length > 0 ? '60px' : ''
      this.$refs.listWrapper.style.bottom = bottom
      this.$refs.favListScroll && this.$refs.favListScroll.refresh()
      this.$refs.playListScroll && this.$refs.playListScroll.refresh()
    },
    switchItem(index) {
      this.currentIndex = index
    },
    selectSong(song) {
      this.insertSong(new Song(song))
    },
    back() {
      this.$router.back()
    },
    random() {
      let list = this.currentIndex === 0 ? this.favoriteList : this.playHistory
      if (list.length === 0) {
        return
      }
      list = list.map((song) => {
        return new Song(song)
      })
      this.randomPlay({ list })
    },
    ...mapActions([
      'insertSong',
      'randomPlay'
    ])
  },
  components: {
    Switches,
    Scroll,
    SongList,
    NoResult
  }
}
</script>

<style lang="scss" scoped>
@import "../../assets/css/variable.scss";

.user-center{
  position: fixed;
  top: 0;
  bottom: 0;
  z-index: 100;
  width: 100%;
  background: $color-background;
  &.slide-enter-active, &.slide-leave-active{
    transition: all 0.3;
  }
  &.slide-enter, &.slide-leave-to{
    transform: translate3d(100%, 0, 0);
  }
  .back{
    position: absolute;
    top: 0;
    left: 6px;
    z-index: 50;
    .icon-back{
      display: block;
      padding: 10px;
      font-size: $font-size-large-x;
      color: $color-theme;
    }
  }
  .switches-wrapper{
    margin: 10px 0 30px 0;
  }
  .play-btn{
    box-sizing: border-box;
    width: 135px;
    padding: 7px 0;
    margin: 0 auto;
    text-align: center;
    border: 1px solid $color-text-l;
    color: $color-text-l;
    border-radius: 100px;
    font-size: 0;
    .icon-play{
      display: inline-block;
      vertical-align: middle;
      margin-right: 6px;
      font-size: $font-size-medium-x;
    }
    .text{
      display: inline-block;
      vertical-align: middle;
      font-size: $font-size-small;
    }
  }
  .list-wrapper{
    position: absolute;
    top: 110px;
    bottom: 0;
    width: 100%;
    .list-scroll{
      height: 100%;
      overflow: hidden;
      .list-inner{
        padding: 20px 30px;
      }
    }
  }
  .no-result-wrapper{
    position: absolute;
    width: 100%;
    top: 50%;
    transform: translateY(-50%);
  }
}
</style>